XHTML Abstraction Markup Language (Haml) is a markup language that‘s used to cleanly and simply describe the XHTML of any web document, without the use of inline code. Haml functions as a replacement for inline page templating systems such as PHP, ERB, and ASP. However, Haml avoids the need for explicitly coding XHTML into the template, because it is actually an abstract description of the XHTML, with some code to generate dynamic content.
Haml Features
Haml can be used in three ways: as a plugin for Ruby on Rails, as a standalone Ruby module, and as a command-line tool.